The next evolution in wireless networking holds promises of self-driving cars and movies that download in the blink of an eye. 5G is big at this year's Mobile World Congress, but don't expect it until 2020.

If you want to know who your friends and acquaintances are dating or where they grew up, you no longer need to wait for them to share those details on Facebook -- the site has introduced a new 'Ask' button, allowing users to send unsolicited requests for personal information.